Grinding-mill



S. l. AND J. S. MILLS.

Patented Ja1i.6,1920.

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SAMUEL JOHN MILLS AND JAMES SLOAN MLLS, 0F FLEMING, SASKATCHEWAN,

CANADA. I

GRINDING-MILL.

Application filed April l2, 1919.

T0 @ZZ whom t may concern:

Be it known that we, SAMUEL JOHN MILLS and JAMES SLOAN MILLS, both subjects of the King of Great Britain, of the town of Fleming, Province of Saskatchewan, Dominion of Canada, have invented certain new and useful improvements in Grinding- Mills, of which the following is a specification.

This invention relates to improvements in grinding mills, and relates more particularly to that class of mill in which metallic grinding-disks or burs are employed in pairs at each end of the mill, thus forming what is known as a double mill, and the principal objects of the invention are to increase the output of this type of mill and economize in power; second, to provide improved means for shaking the chutes which convey the grain from the hopper to the grindingdisks; third, to provide means for conveying the product to a common discharge outlet; fourth, to provide a bearing for the grinding-disk shaft so as to take up all end thrust, and fth, to provide a new and improved construction of grinding-mill frame. Various other objects of the invention will appear in the following specification in which the invention will be described in detail.

Figures l and 2 are elevations from opposite sides of the improved grinding mill.

Fig. 3 is an end elevation thereof.l Fig. l is a vertical longitudinal section on the line 4 4, Fig. 3. Fig. 5 is a horizontal longitudinal section on the line 5-5, Fig. 1, and

Fig. 6 is a vertical longitudinal section onk the line 6 6, Fig. 5, through one of the bearings for the grinding-disk shaft.

In the drawings, like characters of reference refer to the same parts.

It is well-known that in grinding mills employing only one pair of grinding-disks or burs, the end thrust on the grinding-disk.

Specication of Letters Patent.

Patented Jan. e, 1920.

Serial No. 289,714.

able type of end-thrust ball-bearing is essen-v tial to provide for this. it is impossible to have absolutely uniform feed of grain simultaneously into both grinding-disk casings; and furthermore frequently refractory substances become introduced between the grinding disks, thus causing a great increase in end-thrust on the `grinding-disk shaft.

The grinding mill frame comprises a lower table A and an upper table B. Suitable legs or supports C support the lower table above the floor, and suitable legs or supports D support the upper table B in proper relationship to the lower table A. This upper table B is shorter and narrower than the lower table. E is any suitable hopper carried suitably by the upper table B. As will be seen upon referring particularly to Fig. 4l, the bottom of this hopper is provided with two openings F positioned at opposite ends of theconical-shaped diverting member G which compels the grain to feed simultaneously through the openings F into the alined openings H formed in the table B. A cut-ofi' I is provided with plates J which operate against the underside of the table B and are held in position by the brackets K depending below the underside of said table B. The plates J control the escape of grain through the openings F and H. A bracket 2 is carried by the table B and supports the pin 3 which extends through a slot 4C formed in the handle 5 of the cut-off i. This pin limits the outward movement of the cut-olf I and prevents the withdrawal of the same from the brackets K.

6 is the grinding-disk shaft, and the same is mounted 'at leach end in the bearing 7, hereinafter particularly referred to. As will be seen upon referring particularly to Fig. 5, the lower table A is provided with a central opening 7 so as to provide for the location of the shaft 6 and the drive-pulley 8 mounted thereon. The said shaft projects beyond each end of the table A, and as shown by dotted lines in Figs. 1 and 2, projects through the grain-disk casings 9, which are of conventional type. Each grinding-disk casino' is provided with a hopper 10 whereby the grain to be ground is introduced in any convenient manner between the grinding-disks a and b mounted within said grinding-disk casings. The construction of the said casings and grindingdisks are not illustrated since they form specifically no part of the invention. These grinding-disk casings are supported from the legs or supports C by suitable brackets 11. Each grinding-disk casing is provided with a discharge spout 12 which opens into a chute 13 suitably supported thereby at its upper end. The lower end of each of these chutes is supported by the conveyer-tube 14C, which is held in suitable brackets 15, carried by the legs or supports C. As the ground material escapes from the grinding-disk casings 9, it passes through the chutes 13 into the conveyor-tube lll, through openings 16 1n said tube opposite the ldischarge ends of the chutes 13. Suitably mounted within the tube 14 is a screw-conveyor 17. The end 1S of the tube 14 is closed and, therefore, the screw-conveyer 17 will convey the product from this end of the tube to the discharge end 19. Mounted on the shaft 20 of the screw-conveyer 17 is a pulley 21 which is ,driven by a belt 22 which receives power from the pulley 23 carried by a shaft 2st journaled in suitable brackets 25, which are carried by the legs or supports D. .By means of a pulley 26, pbwer is transmitted from the grinding-disk shaft 6 by any suitable type of belt, not necessary to illustrate.

Positioned underneath each pair of' alined openings F and H is a chute 27 whereby the grain is conveyed into the hoppers 10. These chutes are each provided with a handle 28, coupled to their upper ends, and through these handles is passed a pivoting pin 29 which is supported in the table B, as well as in the member G. Mounted in the bearing brackets 30, is a shaft 31 to each end of which is secured a disk 32. Mount ed on a pin 33, carried by each of the disks 32 is a pitman 34C, which is coupled after any suitable manner at its upper end to an eye or other suitable coupling 35, secured to the underside of each of the chutes 27. A pulley 36, carried by the shaft 31, receives energy after any suitable manner from the shaft 6, which drives the shaft 31 and so operates the pitmen 34 to oscillate or shake the chutes 27 around their pivoting pin 29.

The pitmen 34 will be s0 mounted as to actuate the chutes 27 so as to reduce to a minimum the jarring on the mill.

Each chute 13 is provided with a hinged cover a to permit of inspection of the product, without danger to the operator.

Integrally formed with each end of the lowertable A, is a housing section l), which is integrally provided with a bearing-sec tion c. A housing-section CZ Ais also integrally .provided with a bearing-section c, and each of these elements is provided with flanges f, through which nuts and bolts,

designated by the common numeral of reference g, pass so as to hold the elements together to yform the complete bearing.' Each end o of the shaft 6 is reduced, and this construction provides a shoulder 7i, at each end of the unreduced portion of the shaft 6. The end-thrust ball-bearing is preferably composed of two ball-races y' and is, between which operate the balls m, which are mounted in any suitable cage n. The races and Za are supported on the reduced portion o of the shaft 6.

- As shown at p, there is a space between the ball-race y', and the adjacent inner side of the housing composed of the housingsections b and al. rlhis allows for longitudinal shifting of the shaft 6 within certain limits. rThe shifting of the shaft G longitudinally will not be sufficient to displace the elements forming the end-thrust bearing.

Various changes in details of construction may be made without departing from the spirit of this invention.

What is claimed as new is:

1. In a grinding mill, a support; a horizontal table located above said support and carried thereby and provided with a pair of separated openings therethrough; a hopper supported by said table and provided with two separated horizontally-disposed openings which are in alinement with the openings in said table; a horizontally-disposed cut-off positioned underneath said table andprovided with two plates spaced apart which simultaneously control the passage of grain through said openings, and further provided with a handle; means carried by said table to hold said cut-olf operatively in place; a pair of chutes located underneath said cutoff to receive grain from said hopper to convey it to point of consumption, and means non-obstructively positioned and carried by said table for pivoting said chutes rin place at their inner ends.

2. ln a. grinding mill, a support; a horizontal table provided with a pair of separated openings therethrough; means carried by said support to support said horizontal table; a hopper' supported by said table and provided with two separated horizontallydisposed openings which are in alinement with the openings in said table; a cut-off positioned underneath said table to simultaneously control the passage of grain through said openings; a pair of chutes located underneath saidV cut-off to receive grain from said hopper; non-obstructively positioned means carried by said table whereby said chutes are pivoted at their inner ends to said table; a shaft journaled in the support for said table, and means carried by said shaft and coupled to each of the said chutes whereby as said shaft rotates said chutes are moved on their pivoting means.

3. In a. grinding mill, in combination, a horizontal table; legs therefor; a shaft journaled in said legs and projecting kbeyond each end thereof; a grinding disk casing supported at each end of said table, each casing being provided with a discharge spout; a pair of grinding disks mounted within each of the said casings; a oonveyer tube carried by said legs and located below the said discharge spouts, and provided at one end with an intake opening, and at the other end with a discharge opening; a chute for each of the said discharge spouts, suitably supported thereby at its upper end and having its lower end supported by said conveyer tube over its respective opening therein, and a screw conveyer mounted within said conveyer tube.

4. ln a grinding-mill, in combination a table integrally provided at each end with a lower housing element which is provided with a bearing element extending longitudinally of said table; a shaft provided at each end with a reduced portion forming an annular shoulder at each end of the unreduced portion of the shaft; a pair of ball-races mounted on each reduced end of the said shaft, and one thereof resting against the said annular shoulder; a plurality of balls mounted between said ball-races; an upper housingelement integrally provided with a `bearing element designed to co-act with said other housing and bearing elements to incase the journaled ends of said shaft, and a pair of housed grinding-disks located at each end of said shaft and (3o-acting with said shaft, as set forth.

SAMUEL JOHN MILLS. JAMES SLOAN MILLS. 

